2008 YAMAHA WR 450F run flat

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Page 88 of 224

YAMAHA WR 450F 2008  Owners Manual 4-1
ENGINE
TUNING
ENGINE
CARBURETOR SETTING
• The air/fuel mixture will vary de-
pending on atmospheric conditions. 
Therefore, it is necessary to take 
into consideration the air pressure, 
ambient

Page 92 of 224

YAMAHA WR 450F 2008  Owners Manual 4-5
CHASSIS
CHASSIS
SELECTION OF THE SECONDARY 
REDUCTION RATIO (SPROCKET)
<Requirement for selection of sec-
ondary gear reduction ratio>
• It is generally said that the second-
ary gear ratio shou